2021ApJ...910...26T -
Astrophys. J., 910, 26-26 (2021/March-3)
Scattering polarization of 3 µm water-ice feature by large icy grains.
TAZAKI R., MURAKAWA K., MUTO T., HONDA M. and INOUE A.K.
Abstract (from CDS):
Water ice has a strong spectral feature at a wavelength of approximately 3 µm, which plays a vital role in our understanding of the icy universe. In this study, we investigate the scattering polarization of this water-ice feature. The linear polarization degree of light scattered by micron-sized icy grains is known to be enhanced at the ice band; however, the dependence of this polarization enhancement on various grain properties is unclear. We find that the enhanced polarization at the ice band is sensitive to the presence of micron-sized grains as well as their ice abundance. We demonstrate that this enhancement is caused by the high absorbency of the water-ice feature, which attenuates internal scattering and renders the surface reflection dominant over internal scattering. Additionally, we compare our models with polarimetric observations of the low-mass protostar L1551 IRS 5. Our results show that scattering by a maximum grain radius of a few microns with a low water-ice abundance is consistent with observations. Thus, scattering polarization of the water-ice feature is a useful tool for characterizing ice properties in various astronomical environments.
Abstract Copyright:
© 2021. The American Astronomical Society. All rights reserved.
Journal keyword(s):
Circumstellar dust - Spectropolarimetry - Ice destruction - Near infrared astronomy
Simbad objects:
1
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